xref: /dokuwiki/inc/Ui/PageDiff.php (revision 3e2e2c4f3e9418e41f5fb32e3b5b542e9a503c74) 
1<?php
2
3namespace dokuwiki\Ui;
4
5use dokuwiki\ChangeLog\PageChangeLog;
6use dokuwiki\ChangeLog\RevisionInfo;
7use dokuwiki\Form\Form;
8use InlineDiffFormatter;
9use TableDiffFormatter;
10
11/**
12 * DokuWiki PageDiff Interface
13 *
14 * @author Andreas Gohr <andi@splitbrain.org>
15 * @author Satoshi Sahara <sahara.satoshi@gmail.com>
16 * @package dokuwiki\Ui
17 */
18class PageDiff extends Diff
19{
20    /* @var PageChangeLog */
21    protected $changelog;
22
23    /* @var RevisionInfo older revision */
24    protected $RevInfo1;
25    /* @var RevisionInfo newer revision */
26    protected $RevInfo2;
27
28    /* @var string */
29    protected $text;
30
31    /**
32     * PageDiff Ui constructor
33     *
34     * @param string $id  page id
35     */
36    public function __construct($id = null)
37    {
38        global $INFO;
39        if (!isset($id)) $id = $INFO['id'];
40
41        // init preference
42        $this->preference['showIntro'] = true;
43        $this->preference['difftype'] = 'sidebyside'; // diff view type: inline or sidebyside
44
45        parent::__construct($id);
46    }
47
48    /** @inheritdoc */
49    protected function setChangeLog()
50    {
51        $this->changelog = new PageChangeLog($this->id);
52    }
53
54    /**
55     * Set text to be compared with most current version
56     * when it has been externally edited
57     * exclusively use of the compare($old, $new) method
58     *
59     * @param string $text
60     * @return $this
61     */
62    public function compareWith($text = null)
63    {
64        if (isset($text)) {
65            $this->text = $text;
66            $changelog =& $this->changelog;
67
68            // revision info object of older file (left side)
69            $this->RevInfo1 = new RevisionInfo($changelog->getCurrentRevisionInfo());
70            $this->RevInfo1->append([
71                'current' => true,
72                'text' => rawWiki($this->id),
73            ]);
74
75            // revision info object of newer file (right side)
76            $this->RevInfo2 = new RevisionInfo();
77            $this->RevInfo2->append([
78                'date' => false,
79              //'ip'   => '127.0.0.1',
80              //'type' => DOKU_CHANGE_TYPE_CREATE,
81                'id'   => $this->id,
82              //'user' => '',
83              //'sum'  => '',
84                'extra' => 'compareWith',
85              //'sizechange' => strlen($this->text) - io_getSizeFile(wikiFN($this->id)),
86                'current' => false,
87                'text' => cleanText($this->text),
88            ]);
89        }
90        return $this;
91    }
92
93    /**
94     * Handle requested revision(s) and diff view preferences
95     *
96     * @return void
97     */
98    protected function handle()
99    {
100        global $INPUT;
101
102        // retrieve requested rev or rev2
103        if (!isset($this->RevInfo1, $this->RevInfo2)) {
104            parent::handle();
105        }
106
107        // requested diff view type
108        if ($INPUT->has('difftype')) {
109            $this->preference['difftype'] = $INPUT->str('difftype');
110        } else {
111            // read preference from DokuWiki cookie. PageDiff only
112            $mode = get_doku_pref('difftype', null);
113            if (isset($mode)) $this->preference['difftype'] = $mode;
114        }
115
116        if (!$INPUT->has('rev') && !$INPUT->has('rev2')) {
117            global $INFO, $REV;
118            if ($this->id == $INFO['id'])
119                $REV = $this->rev1; // store revision back in $REV
120        }
121    }
122
123    /**
124     * Prepare revision info of comparison pair
125     */
126    protected function preProcess()
127    {
128        global $lang;
129
130        $changelog =& $this->changelog;
131
132        // create revision info object for older and newer sides
133        // RevInfo1 : older, left side
134        // RevInfo2 : newer, right side
135
136        $changelogRev1 = $changelog->getRevisionInfo($this->rev1);
137        $changelogRev2 = $changelog->getRevisionInfo($this->rev2);
138        $changelogRev1['media'] = $changelogRev2['media'] = false;
139
140        $this->RevInfo1 = new RevisionInfo($changelogRev1);
141        $this->RevInfo2 = new RevisionInfo($changelogRev2);
142
143        foreach ([$this->RevInfo1, $this->RevInfo2] as $RevInfo) {
144            $isCurrent = $changelog->isCurrentRevision($RevInfo->val('date'));
145            $RevInfo->isCurrent($isCurrent);
146
147            if ($RevInfo->val('type') == DOKU_CHANGE_TYPE_DELETE || empty($RevInfo->val('type'))) {
148                $text = '';
149            } else {
150                $rev = $isCurrent ? '' : $RevInfo->val('date');
151                $text = rawWiki($this->id, $rev);
152            }
153            $RevInfo->append(['text' => $text]);
154        }
155
156        // msg could displayed only when wrong url typed in browser address bar
157        if ($this->rev2 === false) {
158            msg(sprintf($lang['page_nonexist_rev'],
159                $this->id,
160                wl($this->id, ['do'=>'edit']),
161                $this->id), -1);
162        } elseif (!$this->rev1 || $this->rev1 == $this->rev2) {
163            msg('no way to compare when less than two revisions', -1);
164        }
165    }
166
167    /**
168     * Show diff
169     * between current page version and provided $text
170     * or between the revisions provided via GET or POST
171     *
172     * @author Andreas Gohr <andi@splitbrain.org>
173     *
174     * @return void
175     */
176    public function show()
177    {
178        global $lang;
179
180        if (!isset($this->RevInfo1, $this->RevInfo2)) {
181            // retrieve form parameters: rev, rev2, difftype
182            $this->handle();
183            // prepare revision info of comparison pair, except PageConfrict or PageDraft
184            $this->preProcess();
185        }
186
187        // revision title
188        $rev1Title = trim($this->RevInfo1->showRevisionTitle() .' '. $this->RevInfo1->showCurrentIndicator());
189        $rev1Summary = ($this->RevInfo1->val('date'))
190            ? $this->RevInfo1->showEditSummary() .' '. $this->RevInfo1->showEditor()
191            : '';
192
193        if ($this->RevInfo2->val('extra') == 'compareWith') {
194            $rev2Title = $lang['yours'];
195            $rev2Summary = '';
196        } else {
197            $rev2Title = trim($this->RevInfo2->showRevisionTitle() .' '. $this->RevInfo2->showCurrentIndicator());
198            $rev2Summary = ($this->RevInfo2->val('date'))
199                ? $this->RevInfo2->showEditSummary() .' '. $this->RevInfo2->showEditor()
200                : '';
201        }
202
203        // create difference engine object
204        $Difference = new \Diff(
205                explode("\n", $this->RevInfo1->val('text')),
206                explode("\n", $this->RevInfo2->val('text'))
207        );
208
209        // build paired navigation
210        [$rev1Navi, $rev2Navi] = $this->buildRevisionsNavigation();
211
212        // display intro
213        if ($this->preference['showIntro']) echo p_locale_xhtml('diff');
214
215        // print form to choose diff view type, and exact url reference to the view
216        $this->showDiffViewSelector();
217
218        // assign minor edit checker to the variable
219        $classEditType = function ($changeType) {
220            return ($changeType === DOKU_CHANGE_TYPE_MINOR_EDIT) ? ' class="minor"' : '';
221        };
222
223        // display diff view table
224        echo '<div class="table">';
225        echo '<table class="diff diff_'.$this->preference['difftype'] .'">';
226
227        //navigation and header
228        switch ($this->preference['difftype']) {
229            case 'inline':
230                $title1 = $rev1Title . ($rev1Summary ? '<br />'.$rev1Summary : '');
231                $title2 = $rev2Title . ($rev2Summary ? '<br />'.$rev2Summary : '');
232                // no navigation for PageConflict or PageDraft
233                if ($this->RevInfo2->val('extra') !== 'compareWith') {
234                    echo '<tr>'
235                        .'<td class="diff-lineheader">-</td>'
236                        .'<td class="diffnav">'. $rev1Navi .'</td>'
237                        .'</tr>';
238                    echo '<tr>'
239                        .'<th class="diff-lineheader">-</th>'
240                        .'<th'.$classEditType($this->RevInfo1->val('type')).'>'. $title1 .'</th>'
241                        .'</tr>';
242                }
243                echo '<tr>'
244                    .'<td class="diff-lineheader">+</td>'
245                    .'<td class="diffnav">'. $rev2Navi .'</td>'
246                    .'</tr>';
247                echo '<tr>'
248                    .'<th class="diff-lineheader">+</th>'
249                    .'<th'.$classEditType($this->RevInfo2->val('type')).'>'. $title2 .'</th>'
250                    .'</tr>';
251                // create formatter object
252                $DiffFormatter = new InlineDiffFormatter();
253                break;
254
255            case 'sidebyside':
256            default:
257                $title1 = $rev1Title . ($rev1Summary ? ' '.$rev1Summary : '');
258                $title2 = $rev2Title . ($rev2Summary ? ' '.$rev2Summary : '');
259                // no navigation for PageConflict or PageDraft
260                if ($this->RevInfo2->val('extra') !== 'compareWith') {
261                    echo '<tr>'
262                        .'<td colspan="2" class="diffnav">'. $rev1Navi .'</td>'
263                        .'<td colspan="2" class="diffnav">'. $rev2Navi .'</td>'
264                        .'</tr>';
265                }
266                echo '<tr>'
267                    .'<th colspan="2"'.$classEditType($this->RevInfo1->val('type')).'>'.$title1.'</th>'
268                    .'<th colspan="2"'.$classEditType($this->RevInfo2->val('type')).'>'.$title2.'</th>'
269                    .'</tr>';
270                // create formatter object
271                $DiffFormatter = new TableDiffFormatter();
272                break;
273        }
274
275        // output formatted difference
276        echo $this->insertSoftbreaks($DiffFormatter->format($Difference));
277
278        echo '</table>';
279        echo '</div>';
280    }
281
282    /**
283     * Print form to choose diff view type, and exact url reference to the view
284     */
285    protected function showDiffViewSelector()
286    {
287        global $lang;
288
289        // no revisions selector for PageConflict or PageDraft
290        if ($this->RevInfo2->val('extra') == 'compareWith') return;
291
292        // use timestamp for current revision, date may be false when revisions < 2
293        [$rev1, $rev2] = [(int)$this->RevInfo1->val('date'), (int)$this->RevInfo2->val('date')];
294
295        echo '<div class="diffoptions group">';
296
297        // create the form to select difftype
298        $form = new Form(['action' => wl()]);
299        $form->setHiddenField('id', $this->id);
300        $form->setHiddenField('rev2[0]', $rev1);
301        $form->setHiddenField('rev2[1]', $rev2);
302        $form->setHiddenField('do', 'diff');
303        $options = array(
304                     'sidebyside' => $lang['diff_side'],
305                     'inline' => $lang['diff_inline'],
306        );
307        $input = $form->addDropdown('difftype', $options, $lang['diff_type'])
308            ->val($this->preference['difftype'])
309            ->addClass('quickselect');
310        $input->useInput(false); // inhibit prefillInput() during toHTML() process
311        $form->addButton('do[diff]', 'Go')->attr('type','submit');
312        echo $form->toHTML();
313
314        // show exact url reference to the view when it is meaningful
315        echo '<p>';
316        if ($rev1 && $rev2) {
317            // link to exactly this view FS#2835
318            $viewUrl = $this->diffViewlink('difflink', $rev1, $rev2);
319        }
320        echo $viewUrl ?? '<br />';
321        echo '</p>';
322
323        echo '</div>';
324    }
325
326    /**
327     * Create html for revision navigation
328     *
329     * The navigation consists of older and newer revisions selectors, each
330     * state mutually depends on the selected revision of opposite side.
331     *
332     * @return string[] html of navigation for both older and newer sides
333     */
334    protected function buildRevisionsNavigation()
335    {
336        $changelog =& $this->changelog;
337
338        if ($this->RevInfo2->val('extra') == 'compareWith') {
339            // no revisions selector for PageConflict or PageDraft
340            return array('', '');
341        }
342
343        // use timestamp for current revision, date may be false when revisions < 2
344        [$rev1, $rev2] = [(int)$this->RevInfo1->val('date'), (int)$this->RevInfo2->val('date')];
345
346        // retrieve revisions used in dropdown selectors, even when rev1 or rev2 is false
347        [$revs1, $revs2] = $changelog->getRevisionsAround(
348            ($rev1 ?: $changelog->currentRevision()),
349            ($rev2 ?: $changelog->currentRevision())
350        );
351
352        // build options for dropdown selector
353        $rev1Options = $this->buildRevisionOptions('older', $revs1);
354        $rev2Options = $this->buildRevisionOptions('newer', $revs2);
355
356        // determine previous/next revisions (older/left side)
357        $rev1Prev = $rev1Next = false;
358        if (($index = array_search($rev1, $revs1)) !== false) {
359            $rev1Prev = ($index +1 < count($revs1)) ? $revs1[$index +1] : false;
360            $rev1Next = ($index > 0)                ? $revs1[$index -1] : false;
361        }
362        // determine previous/next revisions (newer/right side)
363        $rev2Prev = $rev2Next = false;
364        if (($index = array_search($rev2, $revs2)) !== false) {
365            $rev2Prev = ($index +1 < count($revs2)) ? $revs2[$index +1] : false;
366            $rev2Next = ($index > 0)                ? $revs2[$index -1] : false;
367        }
368
369        /*
370         * navigation UI for older revisions / Left side:
371         */
372        $rev1Navi = '';
373        // move backward both side: ◀◀
374        if ($rev1Prev && $rev2Prev)
375            $rev1Navi .= $this->diffViewlink('diffbothprevrev', $rev1Prev, $rev2Prev);
376        // move backward left side: ◀
377        if ($rev1Prev)
378            $rev1Navi .= $this->diffViewlink('diffprevrev', $rev1Prev, $rev2);
379        // dropdown
380        $rev1Navi .= $this->buildDropdownSelector('older', $rev1Options);
381        // move forward left side: ▶
382        if ($rev1Next && ($rev1Next < $rev2))
383            $rev1Navi .= $this->diffViewlink('diffnextrev', $rev1Next, $rev2);
384
385        /*
386         * navigation UI for newer revisions / Right side:
387         */
388        $rev2Navi = '';
389        // move backward right side: ◀
390        if ($rev2Prev && ($rev1 < $rev2Prev))
391            $rev2Navi .= $this->diffViewlink('diffprevrev', $rev1, $rev2Prev);
392        // dropdown
393        $rev2Navi .= $this->buildDropdownSelector('newer', $rev2Options);
394        // move forward right side: ▶
395        if ($rev2Next) {
396            if ($changelog->isCurrentRevision($rev2Next)) {
397                $rev2Navi .= $this->diffViewlink('difflastrev', $rev1, $rev2Next);
398            } else {
399                $rev2Navi .= $this->diffViewlink('diffnextrev', $rev1, $rev2Next);
400            }
401        }
402        // move forward both side: ▶▶
403        if ($rev1Next && $rev2Next)
404            $rev2Navi .= $this->diffViewlink('diffbothnextrev', $rev1Next, $rev2Next);
405
406        return array($rev1Navi, $rev2Navi);
407    }
408
409    /**
410     * prepare options for dropdwon selector
411     *
412     * @params string $side  "older" or "newer"
413     * @params array $revs  list of revsion
414     * @return array
415     */
416    protected function buildRevisionOptions($side, $revs)
417    {
418        // use timestamp for current revision, date may be false when revisions < 2
419        [$rev1, $rev2] = [(int)$this->RevInfo1->val('date'), (int)$this->RevInfo2->val('date')];
420
421        $changelog =& $this->changelog;
422        $options = [];
423
424        foreach ($revs as $rev) {
425            $info = $changelog->getRevisionInfo($rev);
426            // revision info may have timestamp key when external edits occurred
427            $info['timestamp'] = $info['timestamp'] ?? true;
428            $date = dformat($info['date']);
429            if ($info['timestamp'] === false) {
430                // exteranlly deleted or older file restored
431                $date = preg_replace('/[0-9a-zA-Z]/','_', $date);
432            }
433            $options[$rev] = array(
434                'label' => implode(' ', [
435                            $date,
436                            editorinfo($info['user'], true),
437                            $info['sum'],
438                           ]),
439                'attrs' => ['title' => $rev],
440            );
441            if (($side == 'older' && ($rev2 && $rev >= $rev2))
442              ||($side == 'newer' && ($rev <= $rev1))
443            ) {
444                $options[$rev]['attrs']['disabled'] = 'disabled';
445            }
446        }
447        return $options;
448    }
449
450    /**
451     * build Dropdown form for revisions navigation
452     *
453     * @params string $side  "older" or "newer"
454     * @params array $options  dropdown options
455     * @return string
456     */
457    protected function buildDropdownSelector($side, $options)
458    {
459        // use timestamp for current revision, date may be false when revisions < 2
460        [$rev1, $rev2] = [(int)$this->RevInfo1->val('date'), (int)$this->RevInfo2->val('date')];
461
462        $form = new Form(['action' => wl($this->id)]);
463        $form->setHiddenField('id', $this->id);
464        $form->setHiddenField('do', 'diff');
465        $form->setHiddenField('difftype', $this->preference['difftype']);
466
467        switch ($side) {
468            case 'older': // left side
469                $form->setHiddenField('rev2[1]', $rev2);
470                $input = $form->addDropdown('rev2[0]', $options)
471                    ->val($rev1)->addClass('quickselect');
472                $input->useInput(false); // inhibit prefillInput() during toHTML() process
473                break;
474            case 'newer': // right side
475                $form->setHiddenField('rev2[0]', $rev1);
476                $input = $form->addDropdown('rev2[1]', $options)
477                    ->val($rev2)->addClass('quickselect');
478                $input->useInput(false); // inhibit prefillInput() during toHTML() process
479                break;
480        }
481        $form->addButton('do[diff]', 'Go')->attr('type','submit');
482        return $form->toHTML();
483    }
484
485    /**
486     * Create html link to a diff view defined by two revisions
487     *
488     * @param string $linktype
489     * @param int $rev1 older revision
490     * @param int $rev2 newer revision or null for diff with current revision
491     * @return string html of link to a diff view
492     */
493    protected function diffViewlink($linktype, $rev1, $rev2 = null)
494    {
495        global $lang;
496        if ($rev1 === false) return '';
497
498        if ($rev2 === null) {
499            $urlparam = array(
500                'do' => 'diff',
501                'rev' => $rev1,
502                'difftype' => $this->preference['difftype'],
503            );
504        } else {
505            $urlparam = array(
506                'do' => 'diff',
507                'rev2[0]' => $rev1,
508                'rev2[1]' => $rev2,
509                'difftype' => $this->preference['difftype'],
510            );
511        }
512        $attr = array(
513            'class' => $linktype,
514            'href'  => wl($this->id, $urlparam, true, '&'),
515            'title' => $lang[$linktype],
516        );
517        return '<a '. buildAttributes($attr) .'><span>'. $lang[$linktype] .'</span></a>';
518    }
519
520
521    /**
522     * Insert soft breaks in diff html
523     *
524     * @param string $diffhtml
525     * @return string
526     */
527    public function insertSoftbreaks($diffhtml)
528    {
529        // search the diff html string for both:
530        // - html tags, so these can be ignored
531        // - long strings of characters without breaking characters
532        return preg_replace_callback('/<[^>]*>|[^<> ]{12,}/', function ($match) {
533            // if match is an html tag, return it intact
534            if ($match[0][0] == '<') return $match[0];
535            // its a long string without a breaking character,
536            // make certain characters into breaking characters by inserting a
537            // word break opportunity (<wbr> tag) in front of them.
538            $regex = <<< REGEX
539(?(?=              # start a conditional expression with a positive look ahead ...
540&\#?\\w{1,6};)     # ... for html entities - we don't want to split them (ok to catch some invalid combinations)
541&\#?\\w{1,6};      # yes pattern - a quicker match for the html entity, since we know we have one
542|
543[?/,&\#;:]         # no pattern - any other group of 'special' characters to insert a breaking character after
544)+                 # end conditional expression
545REGEX;
546            return preg_replace('<'.$regex.'>xu', '\0<wbr>', $match[0]);
547        }, $diffhtml);
548    }
549
550}
551